i have had a small internal lump on my outer right calf (more towards my ankle) for years. (it s not a topical lump but more like an internal bulge.) it throbs terrible, especially when i drive or sit very long. sometimes it hurts so bad at night i can barely think of anything else, not only is it painful, but it stresses me out cause sometimes i feel like it must be like a blood clot feeling. i ve had venous ultra sounds with and told it isn t a blood clot ... but it feels like one!